belongs_to :coupon should be optional at user.rb

[ya-watanabe]

now days, belongs_to fields became required automatically. ref; https://github.com/rails/rails/issues/18233

but it makes "rake db:seed" failure. So can you change it to optional value?

Thank you.

[samuelmaker]

@ya-watanabe did you find a solution for this? adding 'optional: true' to my user.rb gave me another issue when trying to use coupons